Stbae-cylllfbes deaiit-vaxive



A AAQGU'IIRE AND J. M. BONG.

STEAM CYLINDER DRAIN VALVE.

AVPl-ICATION FILED AUG.5. 191s.

LEWAAP A Patented 0m. 21,1919.

I! ATTORNEY iii urn

il t li DEAIN-VALV To all whom it may concern Be it known that We Jenni;h/l oGnn n and JOHN 1V. Bone, both citizens of the United $tstes andresieients Hiiltvuuhee, in the county oat Milwaukee end State, ofWisconsin, have invented certain new and useful "improvements inSitcom-Cylinder llrain-Velves; and We do hereby declare that thefollowing'is a full, clear, enrl. enact description thereof.

@ur invention relates to new and usetul improvements in drain valves forthe cylinclers oi steam engines, more particularly oi? that typeessocietecl with the piston cylinders of locomotives.

iiucli valves are normally urgecl to open position, draining thecylinder, When the engine is not running, ahcl ere held closed. steempressure in the cylinder (luring operation of the engine. Due, lnivveve: to therelatively cool cylinrier in initially tartingthe engine, aheavy condensation of steem occurs at that time with a consequentconsiueralole accumulation meter in the cylintien it is thereforeprimarily the object our invention provide it steam cylinder clrainvnlve Which they he operated: to carry off, cluring operation of theengine, heevy accumulation of Water ct condensation which occurs uponstarting up such opera tion I lit is further object to provide volve oithis cheracter which they else serve to vent the cylinoler of niocoinotive when the locomotive is coasting, enol thus prevent theoccurrence of returoling pressures in the cylinder.

A still further object resitles in the pro" vision vnlve oi thischaracter which is exceedingly simple encl duruhle in construction enclsusceptible of ready operation for the novel functions stetetl.

With these encl other objects view,

'Which Will he apperent es t e description pi'oceeois, our inventionresides in the novel features of construction cornloinetion enc'ierrangement of parts as hereineiter described and defined by theeppenelerl cleini it lasing understood that, changes in the preciseemloodinient might he made loy those shillecl in the nrt Without olecerting from the spiritof the invention.

specification oi ltetters ltatcut.

eppiiention files August t this.

- openin Patented tictn 211, with isciial lilo.

This invention in one practical form in vvhich it may be embodied isillustrated in the accompanying drawing in which:

Figure l is a vertical iongitudinai sectional view through our improvedstean'i cylinder drain valve.

Fig. 2 is a transverse sectional View there through on the line 2% oi 1.

Referring now more particularly to the accompanying drnwin s, 5designates the depending hollow boss of one sort of a locomotive pistoncylincier, which is adapted to receive the clruin valve. @ur improvedstrain valve comprises an upper casing sec tion 6 which has its upperend portion slightly reolucetl for threaded engagement in the hose 5anti terminating in a valve seat '21 The bottom 8 of the upper casingsection is provideclvvith central bore in which is iliahiy mounted: thestem 9 of a valve head 11 adapted to engage on the sent '2', the valveseat being spacecl sufiicient distance from the inner periphery of thecylinder that the valve (loos not project therepest in movemen lowerportion. of the Lip d-er casing section is proviclecl with an outletport iii, encl the upper suriace'oi the bottom 8 is irustoconical inshape whereby to v efiorci complete drainage of Water through saidoutlet port from the casing. The mouth of a lower cup-shaped section 13is threaded on the bottom it the upper section encl stem 9 exteiiclsinto this lower section anti carries a piston sliclehle therein saiclstern having its lower end portion reclucecl to form a consequentshoulcler ens-ages lay the piston. lThe valve is normelly urged toreiseoi position in the absence pressure in the steam cylinder by eneiipnnsiie coil sp ing 15 having one encl seeteci in recess oi thepiston and its other end seetetl in on inner countersunk portion of enattaching; nipple l6 projecting from the hottoin off the lower casingsection. Threuolecl in this nipple is e pipe 1'? which extends to oneport of a three-Way valve 18 having its other port communicatingrespectively with a pipe 19 leading" to suitable source oi. compressedair, encl With the ionosphere.

.in operetion, the spring 15 hohis the valve open in the absence ofoperating pres- L sures in the steam. cylinoler to thus permit freedrainage of the cylinder to prevent damage from freezing. This is thegeneral operation of the conventional drain valves. lVhen the operationof the engine is started and a heavy condensation occurs in the cylinderwhich it is highly desirable to drain off, the valve 18 is operated toadmit compressed air through the pipe 17 into the lower casing portion13, to thus raise the piston and open the valve against any steampressures which may occur in the cylinder, thus providing a drainagesimultaneously with full operation of the engine. It is noted thatopening movement of the valve is facilitated by the fact that the areaof the piston 14 is considerably greater than the area of the-valve head11. In valve opening movement, the outer peripheral portion ofthe pistonseats against the corresponding portion of the bottom 8 of the uppercasing section and thus leakage of the compressed air is prevented, theintermediate portions of the opposed faces of the piston and casingsection bottom being cupped to facilitate this engagement. Upon properdrainage of the steam cylinder, pressure is relieved in the casingsection 13 by opening the three-way valve 18 to the atmosphere, and thesteam cylinder pressures will close the valve 11 against the action ofits lifting sprin 15.

When a locomotive is coasting, air pressure will be introduced into thecasing section 13 to hold the valve 11 open during the period ofcoasting and thus vent the steam cylinder to prevent the occurrence ofretarding pressures therein.

An exceedingly simple and durable arrangement has thus been providedwhereby the steam cylinder of a locomotive may be, at any time, ventedfor the purposes set forth, regardless of pressure conditions in thecylinder.

What is claimed is:

A valve of the class described comprising a cup-shaped upper casingsection provided with an outlet port and having its upper portionthreaded for engagement in the drain outlet of a cylinder, said casingsection being cupped in its bottom surface to afford an annular bearingface and having its lower peripheral portion threaded, a cup-shapedlower casing section having its mouth threaded on said lower portion ofthe upper casing section and provided with an air port in its bottom, astem slidably passed through the bottom of the upper. casing section,and having its lower end portion reduced, a valve head on the upperportion of the stem for closing said upper casing section, a piston diskon the reduced lower portion of the valve stem and slidable in the lowercasing section and having an annular bearing face on its top adjacentits periphery engageable against the bottom bearing face of the uppercasing section, a projection on the piston disk adapted to extend intothe cupped portion of the upper casing section, a nut threaded on thereduced portion of the stem for holding the piston disk, the bottom ofthe piston disk and the bottom of the lower casing section beingprovided with opposed recesses and an expansile coil spring disposedbetween said parts with its ends engaged in the recesses.

In testimony that we claim the foregoing we have hereunto set our handsat Milwaukee, in the county of Milwaukee and State of Wisconsin.

vJAMES MCGUIRE.

JOHN M. BONG.

